土工格栅受力状况的测试新技术

土工格栅在公路和铁路工程中应用广泛,但加筋结构中土工格栅效用的发挥仍不明晰。针对土工格栅受力状况测试的现状,提出采用电感式土工格栅位移计测量加筋结构中土工格栅应变的新技术,并在室内模型试验及现场土工格栅加筋路基试验段进行应用,通过电感式位移计测量的土工格栅应变与传统应变片测试结果及数值计算结果的对比,表明电感式土工格栅位移计测试技术准确可靠,适用于土工格栅加筋结构的现场测试。

New measuring technology of geogrids under load

The geogrids have been widely used in highway and railway projects,but the stress of the geogrids in the reinforcement has not been gotten clearly.In view of the present measuring technology of the geogrids under load,the inductance type displacement meter is introduced to measure the strain of the geogrids in the reinforcement as a testing technology innovation.The inductance type displacement meter is used in the laboratory model tests and the trial section of geogrid-reinforced embankment,and the data measured by the inductance type displacement meters is compared with those measured by usual strain foils and the strain of numerical calculation.The results indicate that the data measured by the inductance type displacement meter is accurate and reliable,and it is applicable to measuring the strain of the geogrids in the field reinforcement.